git.sesse.net Git - ffmpeg/blob - libavcodec/mpeg12enc.c

   1 /*
   2  * MPEG1/2 encoder
   3  * Copyright (c) 2000,2001 Fabrice Bellard
   4  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * MPEG1/2 encoder
  26  */
  27
  28 #include "avcodec.h"
  29 #include "dsputil.h"
  30 #include "mathops.h"
  31 #include "mpegvideo.h"
  32
  33 #include "mpeg12.h"
  34 #include "mpeg12data.h"
  35 #include "bytestream.h"
  36 #include "timecode.h"
  37 #include "libavutil/log.h"
  38 #include "libavutil/opt.h"
  39 #include "libavutil/avassert.h"
  40
  41 static const uint8_t inv_non_linear_qscale[13] = {
  42     0, 2, 4, 6, 8,
  43     9,10,11,12,13,14,15,16,
  44 };
  45
  46 static const uint8_t svcd_scan_offset_placeholder[14] = {
  47     0x10, 0x0E,
  48     0x00, 0x80, 0x81,
  49     0x00, 0x80, 0x81,
  50     0xff, 0xff, 0xff,
  51     0xff, 0xff, 0xff,
  52 };
  53
  54 static void mpeg1_encode_block(MpegEncContext *s,
  55                          DCTELEM *block,
  56                          int component);
  57 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code);    // RAL: f_code parameter added
  58
  59 static uint8_t mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
  60 static uint8_t fcode_tab[MAX_MV*2+1];
  61
  62 static uint8_t  uni_mpeg1_ac_vlc_len [64*64*2];
  63 static uint8_t  uni_mpeg2_ac_vlc_len [64*64*2];
  64
  65 /* simple include everything table for dc, first byte is bits number next 3 are code*/
  66 static uint32_t mpeg1_lum_dc_uni[512];
  67 static uint32_t mpeg1_chr_dc_uni[512];
  68
  69 static uint8_t mpeg1_index_run[2][64];
  70 static int8_t mpeg1_max_level[2][64];
  71
  72 static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
  73     int i;
  74
  75     for(i=0; i<128; i++){
  76         int level= i-64;
  77         int run;
  78         if (!level)
  79             continue;
  80         for(run=0; run<64; run++){
  81             int len, code;
  82
  83             int alevel= FFABS(level);
  84
  85             if (alevel > rl->max_level[0][run])
  86                 code= 111; /*rl->n*/
  87             else
  88                 code= rl->index_run[0][run] + alevel - 1;
  89
  90             if (code < 111 /* rl->n */) {
  91                 /* length of vlc and sign */
  92                 len=   rl->table_vlc[code][1]+1;
  93             } else {
  94                 len=  rl->table_vlc[111/*rl->n*/][1]+6;
  95
  96                 if (alevel < 128) {
  97                     len += 8;
  98                 } else {
  99                     len += 16;
 100                 }
 101             }
 102
 103             uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
 104         }
 105     }
 106 }
 107
 108
 109 static int find_frame_rate_index(MpegEncContext *s){
 110     int i;
 111     int64_t dmin= INT64_MAX;
 112     int64_t d;
 113
 114     for(i=1;i<14;i++) {
 115         int64_t n0= 1001LL/avpriv_frame_rate_tab[i].den*avpriv_frame_rate_tab[i].num*s->avctx->time_base.num;
 116         int64_t n1= 1001LL*s->avctx->time_base.den;
 117         if(s->avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL && i>=9) break;
 118
 119         d = FFABS(n0 - n1);
 120         if(d < dmin){
 121             dmin=d;
 122             s->frame_rate_index= i;
 123         }
 124     }
 125     if(dmin)
 126         return -1;
 127     else
 128         return 0;
 129 }
 130
 131 static av_cold int encode_init(AVCodecContext *avctx)
 132 {
 133     MpegEncContext *s = avctx->priv_data;
 134
 135     if(MPV_encode_init(avctx) < 0)
 136         return -1;
 137
 138 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
 139     if (avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE)
 140         s->drop_frame_timecode = 1;
 141     if (avctx->flags & CODEC_FLAG_SVCD_SCAN_OFFSET)
 142         s->scan_offset = 1;
 143 #endif
 144
 145     if(find_frame_rate_index(s) < 0){
 146         if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 147             av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fps\n", avctx->time_base.den, avctx->time_base.num);
 148             return -1;
 149         }else{
 150             av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issues\n", avctx->time_base.den, avctx->time_base.num);
 151         }
 152     }
 153
 154     if(avctx->profile == FF_PROFILE_UNKNOWN){
 155         if(avctx->level != FF_LEVEL_UNKNOWN){
 156             av_log(avctx, AV_LOG_ERROR, "Set profile and level\n");
 157             return -1;
 158         }
 159         avctx->profile = s->chroma_format == CHROMA_420 ? 4 : 0; /* Main or 4:2:2 */
 160     }
 161
 162     if(avctx->level == FF_LEVEL_UNKNOWN){
 163         if(avctx->profile == 0){ /* 4:2:2 */
 164             if(avctx->width <= 720 && avctx->height <= 608) avctx->level = 5; /* Main */
 165             else                                            avctx->level = 2; /* High */
 166         }else{
 167             if(avctx->profile != 1 && s->chroma_format != CHROMA_420){
 168                 av_log(avctx, AV_LOG_ERROR, "Only High(1) and 4:2:2(0) profiles support 4:2:2 color sampling\n");
 169                 return -1;
 170             }
 171             if(avctx->width <= 720 && avctx->height <= 576) avctx->level = 8; /* Main */
 172             else if(avctx->width <= 1440)                   avctx->level = 6; /* High 1440 */
 173             else                                            avctx->level = 4; /* High */
 174         }
 175     }
 176
 177     s->drop_frame_timecode = s->tc.drop = s->drop_frame_timecode || !!(avctx->flags2 & CODEC_FLAG2_DROP_FRAME_TIMECODE);
 178     if (s->drop_frame_timecode && s->frame_rate_index != 4) {
 179         av_log(avctx, AV_LOG_ERROR, "Drop frame time code only allowed with 1001/30000 fps\n");
 180         return -1;
 181     }
 182
 183     if (s->tc.str) {
 184         s->tc.rate = avpriv_frame_rate_tab[s->frame_rate_index];
 185         if (ff_init_smtpe_timecode(s, &s->tc) < 0)
 186             return -1;
 187         s->avctx->timecode_frame_start = s->tc.start;
 188     } else {
 189         s->avctx->timecode_frame_start = 0; // default is -1
 190     }
 191     return 0;
 192 }
 193
 194 static void put_header(MpegEncContext *s, int header)
 195 {
 196     avpriv_align_put_bits(&s->pb);
 197     put_bits(&s->pb, 16, header>>16);
 198     put_sbits(&s->pb, 16, header);
 199 }
 200
 201 /* put sequence header if needed */
 202 static void mpeg1_encode_sequence_header(MpegEncContext *s)
 203 {
 204         unsigned int vbv_buffer_size;
 205         unsigned int fps, v;
 206         int i;
 207         uint64_t time_code;
 208         float best_aspect_error= 1E10;
 209         float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
 210         int constraint_parameter_flag;
 211
 212         if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
 213
 214         if (s->current_picture.f.key_frame) {
 215             AVRational framerate= avpriv_frame_rate_tab[s->frame_rate_index];
 216
 217             /* mpeg1 header repeated every gop */
 218             put_header(s, SEQ_START_CODE);
 219
 220             put_sbits(&s->pb, 12, s->width );
 221             put_sbits(&s->pb, 12, s->height);
 222
 223             for(i=1; i<15; i++){
 224                 float error= aspect_ratio;
 225                 if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1)
 226                     error-= 1.0/ff_mpeg1_aspect[i];
 227                 else
 228                     error-= av_q2d(ff_mpeg2_aspect[i])*s->height/s->width;
 229
 230                 error= FFABS(error);
 231
 232                 if(error < best_aspect_error){
 233                     best_aspect_error= error;
 234                     s->aspect_ratio_info= i;
 235                 }
 236             }
 237
 238             put_bits(&s->pb, 4, s->aspect_ratio_info);
 239             put_bits(&s->pb, 4, s->frame_rate_index);
 240
 241             if(s->avctx->rc_max_rate){
 242                 v = (s->avctx->rc_max_rate + 399) / 400;
 243                 if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO)
 244                     v = 0x3ffff;
 245             }else{
 246                 v= 0x3FFFF;
 247             }
 248
 249             if(s->avctx->rc_buffer_size)
 250                 vbv_buffer_size = s->avctx->rc_buffer_size;
 251             else
 252                 /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
 253                 vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
 254             vbv_buffer_size= (vbv_buffer_size + 16383) / 16384;
 255
 256             put_sbits(&s->pb, 18, v);
 257             put_bits(&s->pb, 1, 1); /* marker */
 258             put_sbits(&s->pb, 10, vbv_buffer_size);
 259
 260             constraint_parameter_flag=
 261                 s->width <= 768 && s->height <= 576 &&
 262                 s->mb_width * s->mb_height <= 396 &&
 263                 s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 &&
 264                 framerate.num <= framerate.den*30 &&
 265                 s->avctx->me_range && s->avctx->me_range < 128 &&
 266                 vbv_buffer_size <= 20 &&
 267                 v <= 1856000/400 &&
 268                 s->codec_id == CODEC_ID_MPEG1VIDEO;
 269
 270             put_bits(&s->pb, 1, constraint_parameter_flag);
 271
 272             ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
 273             ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
 274
 275             if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 276                 put_header(s, EXT_START_CODE);
 277                 put_bits(&s->pb, 4, 1); //seq ext
 278
 279                 put_bits(&s->pb, 1, s->avctx->profile == 0); //escx 1 for 4:2:2 profile */
 280
 281                 put_bits(&s->pb, 3, s->avctx->profile); //profile
 282                 put_bits(&s->pb, 4, s->avctx->level); //level
 283
 284                 put_bits(&s->pb, 1, s->progressive_sequence);
 285                 put_bits(&s->pb, 2, s->chroma_format);
 286                 put_bits(&s->pb, 2, s->width >>12);
 287                 put_bits(&s->pb, 2, s->height>>12);
 288                 put_bits(&s->pb, 12, v>>18); //bitrate ext
 289                 put_bits(&s->pb, 1, 1); //marker
 290                 put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext
 291                 put_bits(&s->pb, 1, s->low_delay);
 292                 put_bits(&s->pb, 2, 0); // frame_rate_ext_n
 293                 put_bits(&s->pb, 5, 0); // frame_rate_ext_d
 294             }
 295
 296             put_header(s, GOP_START_CODE);
 297             put_bits(&s->pb, 1, s->drop_frame_timecode); /* drop frame flag */
 298             /* time code : we must convert from the real frame rate to a
 299                fake mpeg frame rate in case of low frame rate */
 300             fps = (framerate.num + framerate.den/2)/ framerate.den;
 301             time_code = s->current_picture_ptr->f.coded_picture_number + s->avctx->timecode_frame_start;
 302
 303             s->gop_picture_number = s->current_picture_ptr->f.coded_picture_number;
 304             av_assert0(s->drop_frame_timecode == s->tc.drop);
 305             if (s->tc.drop)
 306                 time_code = ff_framenum_to_drop_timecode(time_code);
 307             put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
 308             put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
 309             put_bits(&s->pb, 1, 1);
 310             put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
 311             put_bits(&s->pb, 6, (uint32_t)((time_code % fps)));
 312             put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP));
 313             put_bits(&s->pb, 1, 0); /* broken link */
 314         }
 315 }
 316
 317 static inline void encode_mb_skip_run(MpegEncContext *s, int run){
 318     while (run >= 33) {
 319         put_bits(&s->pb, 11, 0x008);
 320         run -= 33;
 321     }
 322     put_bits(&s->pb, ff_mpeg12_mbAddrIncrTable[run][1],
 323              ff_mpeg12_mbAddrIncrTable[run][0]);
 324 }
 325
 326 static av_always_inline void put_qscale(MpegEncContext *s)
 327 {
 328     if(s->q_scale_type){
 329         assert(s->qscale>=1 && s->qscale <=12);
 330         put_bits(&s->pb, 5, inv_non_linear_qscale[s->qscale]);
 331     }else{
 332         put_bits(&s->pb, 5, s->qscale);
 333     }
 334 }
 335
 336 void ff_mpeg1_encode_slice_header(MpegEncContext *s){
 337     if (s->height > 2800) {
 338         put_header(s, SLICE_MIN_START_CODE + (s->mb_y & 127));
 339         put_bits(&s->pb, 3, s->mb_y >> 7);  /* slice_vertical_position_extension */
 340     } else {
 341         put_header(s, SLICE_MIN_START_CODE + s->mb_y);
 342     }
 343     put_qscale(s);
 344     put_bits(&s->pb, 1, 0); /* slice extra information */
 345 }
 346
 347 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
 348 {
 349     mpeg1_encode_sequence_header(s);
 350
 351     /* mpeg1 picture header */
 352     put_header(s, PICTURE_START_CODE);
 353     /* temporal reference */
 354
 355     // RAL: s->picture_number instead of s->fake_picture_number
 356     put_bits(&s->pb, 10, (s->picture_number -
 357                           s->gop_picture_number) & 0x3ff);
 358     put_bits(&s->pb, 3, s->pict_type);
 359
 360     s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8;
 361     put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */
 362
 363     // RAL: Forward f_code also needed for B frames
 364     if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 365         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 366         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 367             put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
 368         else
 369             put_bits(&s->pb, 3, 7); /* forward_f_code */
 370     }
 371
 372     // RAL: Backward f_code necessary for B frames
 373     if (s->pict_type == AV_PICTURE_TYPE_B) {
 374         put_bits(&s->pb, 1, 0); /* half pel coordinates */
 375         if(s->codec_id == CODEC_ID_MPEG1VIDEO)
 376             put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
 377         else
 378             put_bits(&s->pb, 3, 7); /* backward_f_code */
 379     }
 380
 381     put_bits(&s->pb, 1, 0); /* extra bit picture */
 382
 383     s->frame_pred_frame_dct = 1;
 384     if(s->codec_id == CODEC_ID_MPEG2VIDEO){
 385         put_header(s, EXT_START_CODE);
 386         put_bits(&s->pb, 4, 8); //pic ext
 387         if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) {
 388             put_bits(&s->pb, 4, s->f_code);
 389             put_bits(&s->pb, 4, s->f_code);
 390         }else{
 391             put_bits(&s->pb, 8, 255);
 392         }
 393         if (s->pict_type == AV_PICTURE_TYPE_B) {
 394             put_bits(&s->pb, 4, s->b_code);
 395             put_bits(&s->pb, 4, s->b_code);
 396         }else{
 397             put_bits(&s->pb, 8, 255);
 398         }
 399         put_bits(&s->pb, 2, s->intra_dc_precision);
 400
 401         assert(s->picture_structure == PICT_FRAME);
 402         put_bits(&s->pb, 2, s->picture_structure);
 403         if (s->progressive_sequence) {
 404             put_bits(&s->pb, 1, 0); /* no repeat */
 405         } else {
 406             put_bits(&s->pb, 1, s->current_picture_ptr->f.top_field_first);
 407         }
 408         /* XXX: optimize the generation of this flag with entropy
 409            measures */
 410         s->frame_pred_frame_dct = s->progressive_sequence;
 411
 412         put_bits(&s->pb, 1, s->frame_pred_frame_dct);
 413         put_bits(&s->pb, 1, s->concealment_motion_vectors);
 414         put_bits(&s->pb, 1, s->q_scale_type);
 415         put_bits(&s->pb, 1, s->intra_vlc_format);
 416         put_bits(&s->pb, 1, s->alternate_scan);
 417         put_bits(&s->pb, 1, s->repeat_first_field);
 418         s->progressive_frame = s->progressive_sequence;
 419         put_bits(&s->pb, 1, s->chroma_format == CHROMA_420 ? s->progressive_frame : 0); /* chroma_420_type */
 420         put_bits(&s->pb, 1, s->progressive_frame);
 421         put_bits(&s->pb, 1, 0); //composite_display_flag
 422     }
 423     if (s->scan_offset) {
 424         int i;
 425
 426         put_header(s, USER_START_CODE);
 427         for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){
 428             put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]);
 429         }
 430     }
 431
 432     s->mb_y=0;
 433     ff_mpeg1_encode_slice_header(s);
 434 }
 435
 436 static inline void put_mb_modes(MpegEncContext *s, int n, int bits,
 437                                 int has_mv, int field_motion)
 438 {
 439     put_bits(&s->pb, n, bits);
 440     if (!s->frame_pred_frame_dct) {
 441         if (has_mv)
 442             put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */
 443         put_bits(&s->pb, 1, s->interlaced_dct);
 444     }
 445 }
 446
 447 static av_always_inline void mpeg1_encode_mb_internal(MpegEncContext *s,
 448                                                    DCTELEM block[6][64],
 449                                                    int motion_x, int motion_y,
 450                                                    int mb_block_count)
 451 {
 452     int i, cbp;
 453     const int mb_x = s->mb_x;
 454     const int mb_y = s->mb_y;
 455     const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
 456
 457     /* compute cbp */
 458     cbp = 0;
 459     for(i=0;i<mb_block_count;i++) {
 460         if (s->block_last_index[i] >= 0)
 461             cbp |= 1 << (mb_block_count - 1 - i);
 462     }
 463
 464     if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 &&
 465         (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) &&
 466         ((s->pict_type == AV_PICTURE_TYPE_P && (motion_x | motion_y) == 0) ||
 467         (s->pict_type == AV_PICTURE_TYPE_B && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
 468         ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
 469         s->mb_skip_run++;
 470         s->qscale -= s->dquant;
 471         s->skip_count++;
 472         s->misc_bits++;
 473         s->last_bits++;
 474         if(s->pict_type == AV_PICTURE_TYPE_P){
 475             s->last_mv[0][1][0]= s->last_mv[0][0][0]=
 476             s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0;
 477         }
 478     } else {
 479         if(first_mb){
 480             assert(s->mb_skip_run == 0);
 481             encode_mb_skip_run(s, s->mb_x);
 482         }else{
 483             encode_mb_skip_run(s, s->mb_skip_run);
 484         }
 485
 486         if (s->pict_type == AV_PICTURE_TYPE_I) {
 487             if(s->dquant && cbp){
 488                 put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */
 489                 put_qscale(s);
 490             }else{
 491                 put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */
 492                 s->qscale -= s->dquant;
 493             }
 494             s->misc_bits+= get_bits_diff(s);
 495             s->i_count++;
 496         } else if (s->mb_intra) {
 497             if(s->dquant && cbp){
 498                 put_mb_modes(s, 6, 0x01, 0, 0);
 499                 put_qscale(s);
 500             }else{
 501                 put_mb_modes(s, 5, 0x03, 0, 0);
 502                 s->qscale -= s->dquant;
 503             }
 504             s->misc_bits+= get_bits_diff(s);
 505             s->i_count++;
 506             memset(s->last_mv, 0, sizeof(s->last_mv));
 507         } else if (s->pict_type == AV_PICTURE_TYPE_P) {
 508             if(s->mv_type == MV_TYPE_16X16){
 509                 if (cbp != 0) {
 510                     if ((motion_x|motion_y) == 0) {
 511                         if(s->dquant){
 512                             put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */
 513                             put_qscale(s);
 514                         }else{
 515                             put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */
 516                         }
 517                         s->misc_bits+= get_bits_diff(s);
 518                     } else {
 519                         if(s->dquant){
 520                             put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */
 521                             put_qscale(s);
 522                         }else{
 523                             put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */
 524                         }
 525                         s->misc_bits+= get_bits_diff(s);
 526                         mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 527                         mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 528                         s->mv_bits+= get_bits_diff(s);
 529                     }
 530                 } else {
 531                     put_bits(&s->pb, 3, 1); /* motion only */
 532                     if (!s->frame_pred_frame_dct)
 533                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 534                     s->misc_bits+= get_bits_diff(s);
 535                     mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);    // RAL: f_code parameter added
 536                     mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);    // RAL: f_code parameter added
 537                     s->qscale -= s->dquant;
 538                     s->mv_bits+= get_bits_diff(s);
 539                 }
 540                 s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x;
 541                 s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y;
 542             }else{
 543                 assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD);
 544
 545                 if (cbp) {
 546                     if(s->dquant){
 547                         put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */
 548                         put_qscale(s);
 549                     }else{
 550                         put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */
 551                     }
 552                 } else {
 553                     put_bits(&s->pb, 3, 1); /* motion only */
 554                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 555                     s->qscale -= s->dquant;
 556                 }
 557                 s->misc_bits+= get_bits_diff(s);
 558                 for(i=0; i<2; i++){
 559                     put_bits(&s->pb, 1, s->field_select[0][i]);
 560                     mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 561                     mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 562                     s->last_mv[0][i][0]=   s->mv[0][i][0];
 563                     s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 564                 }
 565                 s->mv_bits+= get_bits_diff(s);
 566             }
 567             if(cbp) {
 568                 if (s->chroma_y_shift) {
 569                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 570                 } else {
 571                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 572                     put_sbits(&s->pb, 2, cbp);
 573                 }
 574             }
 575             s->f_count++;
 576         } else{
 577             if(s->mv_type == MV_TYPE_16X16){
 578                 if (cbp){    // With coded bloc pattern
 579                     if (s->dquant) {
 580                         if(s->mv_dir == MV_DIR_FORWARD)
 581                             put_mb_modes(s, 6, 3, 1, 0);
 582                         else
 583                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 0);
 584                         put_qscale(s);
 585                     } else {
 586                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 0);
 587                     }
 588                 }else{    // No coded bloc pattern
 589                     put_bits(&s->pb, 5-s->mv_dir, 2);
 590                     if (!s->frame_pred_frame_dct)
 591                         put_bits(&s->pb, 2, 2); /* motion_type: frame */
 592                     s->qscale -= s->dquant;
 593                 }
 594                 s->misc_bits += get_bits_diff(s);
 595                 if (s->mv_dir&MV_DIR_FORWARD){
 596                     mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
 597                     mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
 598                     s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0];
 599                     s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1];
 600                     s->f_count++;
 601                 }
 602                 if (s->mv_dir&MV_DIR_BACKWARD){
 603                     mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
 604                     mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
 605                     s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0];
 606                     s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1];
 607                     s->b_count++;
 608                 }
 609             }else{
 610                 assert(s->mv_type == MV_TYPE_FIELD);
 611                 assert(!s->frame_pred_frame_dct);
 612                 if (cbp){    // With coded bloc pattern
 613                     if (s->dquant) {
 614                         if(s->mv_dir == MV_DIR_FORWARD)
 615                             put_mb_modes(s, 6, 3, 1, 1);
 616                         else
 617                             put_mb_modes(s, 8-s->mv_dir, 2, 1, 1);
 618                         put_qscale(s);
 619                     } else {
 620                         put_mb_modes(s, 5-s->mv_dir, 3, 1, 1);
 621                     }
 622                 }else{    // No coded bloc pattern
 623                     put_bits(&s->pb, 5-s->mv_dir, 2);
 624                     put_bits(&s->pb, 2, 1); /* motion_type: field */
 625                     s->qscale -= s->dquant;
 626                 }
 627                 s->misc_bits += get_bits_diff(s);
 628                 if (s->mv_dir&MV_DIR_FORWARD){
 629                     for(i=0; i<2; i++){
 630                         put_bits(&s->pb, 1, s->field_select[0][i]);
 631                         mpeg1_encode_motion(s, s->mv[0][i][0] -  s->last_mv[0][i][0]    , s->f_code);
 632                         mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code);
 633                         s->last_mv[0][i][0]=   s->mv[0][i][0];
 634                         s->last_mv[0][i][1]= 2*s->mv[0][i][1];
 635                     }
 636                     s->f_count++;
 637                 }
 638                 if (s->mv_dir&MV_DIR_BACKWARD){
 639                     for(i=0; i<2; i++){
 640                         put_bits(&s->pb, 1, s->field_select[1][i]);
 641                         mpeg1_encode_motion(s, s->mv[1][i][0] -  s->last_mv[1][i][0]    , s->b_code);
 642                         mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code);
 643                         s->last_mv[1][i][0]=   s->mv[1][i][0];
 644                         s->last_mv[1][i][1]= 2*s->mv[1][i][1];
 645                     }
 646                     s->b_count++;
 647                 }
 648             }
 649             s->mv_bits += get_bits_diff(s);
 650             if(cbp) {
 651                 if (s->chroma_y_shift) {
 652                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp][1], ff_mpeg12_mbPatTable[cbp][0]);
 653                 } else {
 654                     put_bits(&s->pb, ff_mpeg12_mbPatTable[cbp>>2][1], ff_mpeg12_mbPatTable[cbp>>2][0]);
 655                     put_sbits(&s->pb, 2, cbp);
 656                 }
 657             }
 658         }
 659         for(i=0;i<mb_block_count;i++) {
 660             if (cbp & (1 << (mb_block_count - 1 - i))) {
 661                 mpeg1_encode_block(s, block[i], i);
 662             }
 663         }
 664         s->mb_skip_run = 0;
 665         if(s->mb_intra)
 666             s->i_tex_bits+= get_bits_diff(s);
 667         else
 668             s->p_tex_bits+= get_bits_diff(s);
 669     }
 670 }
 671
 672 void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y)
 673 {
 674     if (s->chroma_format == CHROMA_420) mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 6);
 675     else                                mpeg1_encode_mb_internal(s, block, motion_x, motion_y, 8);
 676 }
 677
 678 // RAL: Parameter added: f_or_b_code
 679 static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
 680 {
 681     if (val == 0) {
 682         /* zero vector */
 683         put_bits(&s->pb,
 684                  ff_mpeg12_mbMotionVectorTable[0][1],
 685                  ff_mpeg12_mbMotionVectorTable[0][0]);
 686     } else {
 687         int code, sign, bits;
 688         int bit_size = f_or_b_code - 1;
 689         int range = 1 << bit_size;
 690         /* modulo encoding */
 691         val = sign_extend(val, 5 + bit_size);
 692
 693         if (val >= 0) {
 694             val--;
 695             code = (val >> bit_size) + 1;
 696             bits = val & (range - 1);
 697             sign = 0;
 698         } else {
 699             val = -val;
 700             val--;
 701             code = (val >> bit_size) + 1;
 702             bits = val & (range - 1);
 703             sign = 1;
 704         }
 705
 706         assert(code > 0 && code <= 16);
 707
 708         put_bits(&s->pb,
 709                  ff_mpeg12_mbMotionVectorTable[code][1],
 710                  ff_mpeg12_mbMotionVectorTable[code][0]);
 711
 712         put_bits(&s->pb, 1, sign);
 713         if (bit_size > 0) {
 714             put_bits(&s->pb, bit_size, bits);
 715         }
 716     }
 717 }
 718
 719 void ff_mpeg1_encode_init(MpegEncContext *s)
 720 {
 721     static int done=0;
 722
 723     ff_mpeg12_common_init(s);
 724
 725     if(!done){
 726         int f_code;
 727         int mv;
 728         int i;
 729
 730         done=1;
 731         init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
 732         init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
 733
 734         for(i=0; i<64; i++)
 735         {
 736                 mpeg1_max_level[0][i]= ff_rl_mpeg1.max_level[0][i];
 737                 mpeg1_index_run[0][i]= ff_rl_mpeg1.index_run[0][i];
 738         }
 739
 740         init_uni_ac_vlc(&ff_rl_mpeg1, uni_mpeg1_ac_vlc_len);
 741         if(s->intra_vlc_format)
 742             init_uni_ac_vlc(&ff_rl_mpeg2, uni_mpeg2_ac_vlc_len);
 743
 744         /* build unified dc encoding tables */
 745         for(i=-255; i<256; i++)
 746         {
 747                 int adiff, index;
 748                 int bits, code;
 749                 int diff=i;
 750
 751                 adiff = FFABS(diff);
 752                 if(diff<0) diff--;
 753                 index = av_log2(2*adiff);
 754
 755                 bits= ff_mpeg12_vlc_dc_lum_bits[index] + index;
 756                 code= (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
 757                 mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
 758
 759                 bits= ff_mpeg12_vlc_dc_chroma_bits[index] + index;
 760                 code= (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
 761                 mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
 762         }
 763
 764         for(f_code=1; f_code<=MAX_FCODE; f_code++){
 765             for(mv=-MAX_MV; mv<=MAX_MV; mv++){
 766                 int len;
 767
 768                 if(mv==0) len= ff_mpeg12_mbMotionVectorTable[0][1];
 769                 else{
 770                     int val, bit_size, code;
 771
 772                     bit_size = f_code - 1;
 773
 774                     val=mv;
 775                     if (val < 0)
 776                         val = -val;
 777                     val--;
 778                     code = (val >> bit_size) + 1;
 779                     if(code<17){
 780                         len= ff_mpeg12_mbMotionVectorTable[code][1] + 1 + bit_size;
 781                     }else{
 782                         len= ff_mpeg12_mbMotionVectorTable[16][1] + 2 + bit_size;
 783                     }
 784                 }
 785
 786                 mv_penalty[f_code][mv+MAX_MV]= len;
 787             }
 788         }
 789
 790
 791         for(f_code=MAX_FCODE; f_code>0; f_code--){
 792             for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
 793                 fcode_tab[mv+MAX_MV]= f_code;
 794             }
 795         }
 796     }
 797     s->me.mv_penalty= mv_penalty;
 798     s->fcode_tab= fcode_tab;
 799     if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 800         s->min_qcoeff=-255;
 801         s->max_qcoeff= 255;
 802     }else{
 803         s->min_qcoeff=-2047;
 804         s->max_qcoeff= 2047;
 805     }
 806     if (s->intra_vlc_format) {
 807         s->intra_ac_vlc_length=
 808         s->intra_ac_vlc_last_length= uni_mpeg2_ac_vlc_len;
 809     } else {
 810         s->intra_ac_vlc_length=
 811         s->intra_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 812     }
 813     s->inter_ac_vlc_length=
 814     s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len;
 815 }
 816
 817 static inline void encode_dc(MpegEncContext *s, int diff, int component)
 818 {
 819   if(((unsigned) (diff+255)) >= 511){
 820         int index;
 821
 822         if(diff<0){
 823             index= av_log2_16bit(-2*diff);
 824             diff--;
 825         }else{
 826             index= av_log2_16bit(2*diff);
 827         }
 828         if (component == 0) {
 829             put_bits(
 830                 &s->pb,
 831                 ff_mpeg12_vlc_dc_lum_bits[index] + index,
 832                 (ff_mpeg12_vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)));
 833         }else{
 834             put_bits(
 835                 &s->pb,
 836                 ff_mpeg12_vlc_dc_chroma_bits[index] + index,
 837                 (ff_mpeg12_vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)));
 838         }
 839   }else{
 840     if (component == 0) {
 841         put_bits(
 842             &s->pb,
 843             mpeg1_lum_dc_uni[diff+255]&0xFF,
 844             mpeg1_lum_dc_uni[diff+255]>>8);
 845     } else {
 846         put_bits(
 847             &s->pb,
 848             mpeg1_chr_dc_uni[diff+255]&0xFF,
 849             mpeg1_chr_dc_uni[diff+255]>>8);
 850     }
 851   }
 852 }
 853
 854 static void mpeg1_encode_block(MpegEncContext *s,
 855                                DCTELEM *block,
 856                                int n)
 857 {
 858     int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
 859     int code, component;
 860     const uint16_t (*table_vlc)[2] = ff_rl_mpeg1.table_vlc;
 861
 862     last_index = s->block_last_index[n];
 863
 864     /* DC coef */
 865     if (s->mb_intra) {
 866         component = (n <= 3 ? 0 : (n&1) + 1);
 867         dc = block[0]; /* overflow is impossible */
 868         diff = dc - s->last_dc[component];
 869         encode_dc(s, diff, component);
 870         s->last_dc[component] = dc;
 871         i = 1;
 872         if (s->intra_vlc_format)
 873             table_vlc = ff_rl_mpeg2.table_vlc;
 874     } else {
 875         /* encode the first coefficient : needs to be done here because
 876            it is handled slightly differently */
 877         level = block[0];
 878         if (abs(level) == 1) {
 879                 code = ((uint32_t)level >> 31); /* the sign bit */
 880                 put_bits(&s->pb, 2, code | 0x02);
 881                 i = 1;
 882         } else {
 883             i = 0;
 884             last_non_zero = -1;
 885             goto next_coef;
 886         }
 887     }
 888
 889     /* now quantify & encode AC coefs */
 890     last_non_zero = i - 1;
 891
 892     for(;i<=last_index;i++) {
 893         j = s->intra_scantable.permutated[i];
 894         level = block[j];
 895     next_coef:
 896         /* encode using VLC */
 897         if (level != 0) {
 898             run = i - last_non_zero - 1;
 899
 900             alevel= level;
 901             MASK_ABS(sign, alevel)
 902             sign&=1;
 903
 904             if (alevel <= mpeg1_max_level[0][run]){
 905                 code= mpeg1_index_run[0][run] + alevel - 1;
 906                 /* store the vlc & sign at once */
 907                 put_bits(&s->pb, table_vlc[code][1]+1, (table_vlc[code][0]<<1) + sign);
 908             } else {
 909                 /* escape seems to be pretty rare <5% so I do not optimize it */
 910                 put_bits(&s->pb, table_vlc[111][1], table_vlc[111][0]);
 911                 /* escape: only clip in this case */
 912                 put_bits(&s->pb, 6, run);
 913                 if(s->codec_id == CODEC_ID_MPEG1VIDEO){
 914                     if (alevel < 128) {
 915                         put_sbits(&s->pb, 8, level);
 916                     } else {
 917                         if (level < 0) {
 918                             put_bits(&s->pb, 16, 0x8001 + level + 255);
 919                         } else {
 920                             put_sbits(&s->pb, 16, level);
 921                         }
 922                     }
 923                 }else{
 924                     put_sbits(&s->pb, 12, level);
 925                 }
 926             }
 927             last_non_zero = i;
 928         }
 929     }
 930     /* end of block */
 931     put_bits(&s->pb, table_vlc[112][1], table_vlc[112][0]);
 932 }
 933
 934 #define OFFSET(x) offsetof(MpegEncContext, x)
 935 #define VE AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
 936 #define COMMON_OPTS\
 937         {TIMECODE_OPT(MpegEncContext,\
 938          AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)},\
 939     { "intra_vlc",           "Use MPEG-2 intra VLC table.",       OFFSET(intra_vlc_format),    AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },\
 940     { "drop_frame_timecode", "Timecode is in drop frame format.", OFFSET(drop_frame_timecode), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE}, \
 941     { "scan_offset",         "Reserve space for SVCD scan offset user data.", OFFSET(scan_offset), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 942
 943 static const AVOption mpeg1_options[] = {
 944     COMMON_OPTS
 945     { NULL },
 946 };
 947
 948 static const AVOption mpeg2_options[] = {
 949     COMMON_OPTS
 950     { "non_linear_quant",    "Use nonlinear quantizer.",          OFFSET(q_scale_type),         AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 951     { "alternate_scan",      "Enable alternate scantable.",       OFFSET(alternate_scan),       AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
 952     { NULL },
 953 };
 954
 955 #define mpeg12_class(x)\
 956 static const AVClass mpeg## x ##_class = {\
 957     .class_name   = "mpeg" #x "video encoder",\
 958     .item_name    = av_default_item_name,\
 959     .option       = mpeg## x ##_options,\
 960     .version      = LIBAVUTIL_VERSION_INT,\
 961 };
 962
 963 mpeg12_class(1)
 964 mpeg12_class(2)
 965
 966 AVCodec ff_mpeg1video_encoder = {
 967     .name           = "mpeg1video",
 968     .type           = AVMEDIA_TYPE_VIDEO,
 969     .id             = CODEC_ID_MPEG1VIDEO,
 970     .priv_data_size = sizeof(MpegEncContext),
 971     .init           = encode_init,
 972     .encode         = MPV_encode_picture,
 973     .close          = MPV_encode_end,
 974     .supported_framerates= avpriv_frame_rate_tab+1,
 975     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
 976     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 977     .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
 978     .priv_class     = &mpeg1_class,
 979 };
 980
 981 AVCodec ff_mpeg2video_encoder = {
 982     .name           = "mpeg2video",
 983     .type           = AVMEDIA_TYPE_VIDEO,
 984     .id             = CODEC_ID_MPEG2VIDEO,
 985     .priv_data_size = sizeof(MpegEncContext),
 986     .init           = encode_init,
 987     .encode         = MPV_encode_picture,
 988     .close          = MPV_encode_end,
 989     .supported_framerates= avpriv_frame_rate_tab+1,
 990     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
 991     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS,
 992     .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
 993     .priv_class     = &mpeg2_class,
 994 };